Answer: 3
Step-by-step explanation: your welcome even if im wrong
It will take him 16 hours because 25 is 1/4 of 100% so 4 times 4 is 16. So 16 is your answer :)
<h2>
Answer:</h2>
The quadratic function are:
option: A A) y(y + 4) - y = 6
Option: C C.) 4b(b) = 0
<h2>
Step-by-step explanation:</h2>
We know that the general equation of a quadratic equation in terms of a variable x is given by:

A)
y(y + 4) - y = 6
On simplifying the terms we have:

Hence, option: A is correct.
B)
(3x + 2) + (6x - 1) = 0

Hence, it is a linear equation.
Hence, option: B is incorrect.
C)
4b(b) = 0
it could also be written as:

Hence, it is a quadratic equation.
Hence, option: C is correct.
D)
3a - 7 = 2(7a - 3)

which is again a linear equation.
Hence, option: D is incorrect.
Answer:
n = 30 pieces
Step-by-step explanation:
Firstly calculate the number of pieces that Luna's puzzle has....,
;180 ÷ 4 = 45 pieces
Hence if Luna has used 15 pieces...then the number of pieces left,
; 45 - 15 = n
;Hence..., n = 30 pieces